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Full text of "IS 13360-3-6: Plastics - Methods of Testing, Part 3: Physical and Dimensional Properties, Section 6: Film and Sheeting - Determination of Average Thickness of a Sample, and Average Thickness"

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in order to promote transparency and accountability in the working of every public authority, 
and whereas the attached publication of the Bureau of Indian Standards is of particular interest 
to the public, particularly disadvantaged communities and those engaged in the pursuit of 
education and knowledge, the attached public safety standard is made available to promote the 
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IS 13360-3-6 (2000): Plastics - Methods of Testing, Part 3: 
Physical and Dimensional Properties, Section 6: Film and 
Sheeting - Determination of Average Thickness of a Sample, 
and Average Thickness [PCD 12: Plastics] 




Jawaharlal Nehru 
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PROTECTED BY COPYRIGHT 



IS 13360 ( Part 3/Sec 6 ) : 2000 
ISO 4591 : 1992 

Indian Standard 
PLASTICS — METHODS OF TESTING 

PART 3 PHYSICAL AND DIMENSIONAL PROPERTIES 

Section 6 Film and Sheeting — Determination of Average Thickness of a Sample, and Average 
Thickness and Yield of a Roll by Gravimetric Techniques ( Gravimetric Thickness ) 



ICS 83.140.01 



© BIS 2000 

BUREAU OF INDIAN STANDARDS 

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG 
NEW DELHI 110002 

July 2000 Price Group 2 



Methods of Test for Plastics Sectional Committee, PCD 23 



NATIONAL FOREWORD 

This Indian Standard which is identical with ISO 4591 : 1 992 Plastics — Film and sheeting — Determination 
of average thickness of a sample, and average thickness and yield of a roll, by gravimetric techniques 
(gravimetric thickness)' issued by the International Organization for Standardization (ISO) was adopted 
by the Bureau of Indian Standards on the recommendation of Methods of Test for Plastics Sectional 
Committee and approval of the Petroleum, Coal and Related Products Division Council. 

The text of ISO standard has been approved as suitable for publication as Indian Standard without 
deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention 
is particularly drawn to the following: 

a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 
Indian Standard'. 

b) Comma ( , ) has been used as a decimal marker while in Indian Standards, the current practice is to 
use a point ( . ) as the decimal marker. 

In this adopted standard, reference appears to certain International Standards for which Indian Standards 
also exist. The corresponding Indian Standards which are to be substituted in their place are listed 
below along with their degree of equivalence for the editions indicated: 



International Standard 

ISO 1183: 1997 Plastics — 
Methods for determining the 
density and relative density 
of non-cellular plastics 

ISO 4592: 1992 Plastics — 
Film and sheeting determination 
of length and width 



Corresponding Indian Standard 

IS 13360 (Part 3/Sec 1) : 1995 Plastics — 
Methods of testing : Part 3 Physical 
and dimensional properties, Section 1 
Determination of density and relative 
density of non-cellular plastics 

Nil 



Degree of 
Equivalence 

Identical 



In the case of ISO 4592, the Technical Committee responsible for the preparation of this standard has 
reviewed its contents and has decided that it is acceptable for use in conjunction with this standard. 

In reporting the results of a test or analysis made in accordance with this standard, if the final value, 
observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 'Rules for 
rounding off numerical values ( revised) 1 . 



IS 13360(Part3/Sec6):2000 
ISO 4591 :1992 



Indian Standard 
PLASTICS — METHODS OF TESTING 

PART 3 PHYSICAL AND DIMENSIONAL PROPERTIES 

Section 3 Film and Sheeting — Determination of Average Thickness of a Sample, and Average 
Thickness and Yield of a Roll by Gravimetric Techniques ( Gravimetric Thickness ) 



1 Scope 

This International Standard specifies 

— a method for the determination of the gravimetric 
thickness of a sample of plastics film or sheeting 
(see clause 3); 

— a method for the determination of the average 
gravimetric thickness and, if required, the yield 
(area per unit mass) of a roll of plastics film or 
sheeting (see clause 4). 

These methods are applicable to all plastics films and 
sheeting, and have special value when mechanical 
scanning is not sufficiently precise, particularly for 
measuring the thickness of embossed sheeting. 



3 Determination of gravimetric 
thickness of a sample 

3.1 Principle 

The gravimetric thickness of a sample is calculated 
from measurements of its mass, area and density. 

3.2 Apparatus 



3.2.1 Knife-edged punch, square or circular, having 
an area of 100 cm 2 ± 0,5 cm 2 , or 

3.2.2 Square template, having an area of 
100 cm 2 ± 0,5 cm 2 . 

3.2.3 Balance, accurate to 0,000 1 g. 



2 Normative references 

The following standards contain provisions which, 
through reference in this text, constitute provisions 
of this International Standard. At the time of publica- 
tion, the editions indicated were valid. All standards 
are subject to revision, and parties to agreements 
based on this International Standard are encouraged 
to investigate the possibility of applying the most re- 
cent editions of the standards indicated below. 
Members of IEC and ISO maintain registers of cur- 
rently valid International Standards. 

ISO 1183:1987, Plastics — Methods for determining 
the density and relative density of non-cellular 
plastics. 

ISO 4592:1992, Plastics — Film and sheeting — De- 
termination of length and width. 



3.3 Specimens 

Specimens of area 100 cm 2 ± 0,5 cm 2 shall be cut at 
positions approximately equally spaced across the 
width of the sample in each of two bands approxi- 
mately 1 m apart in the longitudinal direction. 

The minimum number of specimens taken from each 
band across the film or sheeting shall be dependent 
on the width of the sample as follows: 



widths smaller than or equal to 1 000 mm 

widths greater than 1 000 mm and up to 
1 500 mm 

widths greater than 1 500 mm 



5 
10 



In the case of very thin film, when the mass of a 
specimen of area 100 cm 2 + 0,5 cm 2 is less than 
1 g, two specimens located very close together on 
the film in the longitudinal (extrusion/calender) direc- 
tion shall be used for one measurement. 



IS 1 3360 ( Part 3/Sec6): 2000 
ISO 4591 :1992 



3.4 Procedure 



,3.4.1 Determine the mass, in grams, of the speci- 
men to at least three significant figures, and its den- 
sity in accordance with ISO 1183, at a temperature 
of 23 °C ± 1 °C. 

Take care to prevent the formation of static charges 
which could affect the reproducibility of this determi- 
nation of mass. 



3.4.2 For moisture-sensitive film or sheeting, the 
conditioning requirements of time and relative hu- 
midity shall be agreed between the buyer and seller. 



3.5 Expression of results 

Calculate the gravimetric thickness, r s , in micrometres 
or millimetres, from equation (1) or (2) respectively, 
when one specimen is used: 



100 m, 



(urn) 



t — — L- 
s 10p 



(mm) 



(D 
(2) 



where 

m s is the mass, in grams, of the specimen; 

p is the density, in grams per cubic centi- 
metre, of the specimen. 

When two specimens are used, use equation (3) or 
(4): 



50 m c 



/n c 



■(Jim) 



, s= __ (mm) 



3.6 Precision 



.-(3) 
.-(4) 



The precision of this test method is not known be- 
cause inter-laboratory data are not available. When 
inter-laboratory data are obtained, a precision state- 
ment will be added in the subsequent revision. 



3.7 Test report 

The test report shall include the following information: 

a) a reference to this International Standard; 

b) all information necessary for the complete identi- 
fication of the sample; 



c) gravimetric thickness of each specimen, in mi- 
crometres or millimetres; 

d) arithmetic mean of the test results, to the nearest 
1 urn, or 0,001 mm, reported as the average 
gravimetric thickness of the sample. 

4 Determination of average gravimetric 
thickness and yield of a roll 

4.1 Principle 

The average thickness and, if required, the yield of a 
roll are calculated from measurements of the length, 
average width and net mass of the roll and of the 
density of the film or sheeting. 



at 



4.2 Apparatus 

4.2.1 Weighing device, the accuracy of which is 
least 0,5 % of the reading. 

4.3 Procedure 

4.3.1 Length and average width of film or 
sheeting in a roll 



Determine the length and average width of the roll, in 
metres, in accordance with ISO 4592. 

4.3.2 Net mass of roll 

Place the roll of material centrally on the pan or other 
support of the weighing device. Ensure that the roll 
of material and the pan are free from contact with 
other bodies. 

Determine the gross mass to an accuracy of 0,5 %. 
Deduct the mass of the tube, or other object onto 
which the film or sheeting has been rolled, from the 
gross mass to give the net roll mass, with the same 
accuracy. 

Determine the net roll mass, in kilograms, to the 
nearest significant figure corresponding to an accu- 
racy of 0,5 %. 

4.3.3 Density 

Determine the density of the film or sheeting in ac- 
cordance with ISO 1 183, at 23 °C ± 1 °C. 

4.4 Expression of results 

4.4.1 Average gravimetric thickness of roll 

Calculate the average gravimetric thickness of the roll, 
t v in micrometres or millimetres, from equation (5) or 
(6) respectively: 



IS 13360 ( Part 3/Sec 6 ) : 2000 
ISO 4591 : 1992 



1 000 rru 
U = - — ; L (ixm) 



r L x b x p 
r L x b x p 



(mm) 



.-(5) 
..(6) 



where 
rrir 
L 
b 
P 



is the net mass, in kilograms, of the roll; 

is the length, in metres, of the roll; 

is the average width, in metres, of the roil; 

is the density, in grams per cubic centi- 
metre, of the film or sheeting. 



Express the result to the nearest 1 urn or 0,001 mm 
respectively. 

4.4.2 Yield (area per unit mass) 

If required, calculate the yield, A m , in square metres 
per kilogram, from equation (7): 



Lxb 



..-(7) 



where L t b and m, are as defined in 4.4.1 . 

4.5 Precision 

The precision of this test method is not known be- 
cause inter-laboratory data are not available. When 
inter-laboratory data are obtained, b precision state- 
ment will be added in the subsequent revision. 

4.6 Test report 

The test report shall include the following information: 

a) a reference to this International Standard; 

b) ail information necessary for the complete identi- 
fication of the material; 

c) average gravimetric thickness of the tested roll; 

d) yield of the roll (if required). 



Bureau of Indian Standards 

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious 
development of the activities of standardization, marking and quality certification of goods and attending to 
connected matters in the country. 

Copyright 

BIS has the copyright of all its publitations. No part of these publications may be reproduced in any form without 
the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the 
standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to 
copyright be addressed to the Director (Publications), BIS. 

Review of Indian Standards 

Amendments are issued to standards as the need arises on the basis of comment$. Standards are also reviewed 
periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are 
needed; if the review indicates that changes are needed, it i$ taken up for revision. Users of Indian Standards 
should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue 
of 'BIS Handbook' and 'Standards : Monthly Additions'. 

This Indian Standard has been developed from Doc : No. PCD 23 ( 1667 ). 

Amendments Issued Since Publication 

Amend No. Date of Issue Text Affected 



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